/*
 * Licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.gearpump.metrics

import com.codahale.metrics.{Histogram => CodaHaleHistogram}

/**
 * @see com.codahale.metrics.Histogram
 */
class Histogram(val name: String, histogram: CodaHaleHistogram, sampleRate: Int = 1) {
  private var sampleCount = 0L

  def update(value: Long) {
    sampleCount += 1
    if (null != histogram && sampleCount % sampleRate == 0) {
      histogram.update(value)
    }
  }

  def getMean(): Double = {
    histogram.getSnapshot.getMean
  }

  def getStdDev(): Double = {
    histogram.getSnapshot.getStdDev
  }
}